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प्रश्न
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उत्तर
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संबंधित प्रश्न
Write true or false for a given statement.
Loudness depends on frequency.
State the factors on which the pitch of a sound depends.
Why are the waves mentioned by you not audible to us?
Define the term wave velocity. Write its S.I. unit.
The sound of an explosion on the surface of a lake is heard by a boat man 100 m away and by a diver 100 m below the point of explosion.
(i) Who would hear the sound first: boatman or diver?
(ii) Give a reason for your answer in part (i).
(iii) If sound takes time t to reach the boatman, how much time approximately does it take to reach the diver?
A cannon is fired at A (see diagram). An observer at B hears two sounds. The first sound is heard after 1 second and the second 3s after the observer sees the flash. (Velocity of sound = 340 ms−1)
(i) Why does the observer see the flash before he hears the sound?
(ii) Calculate the distance x between the observer and the wall.
Select the correct option:
The longitudinal waves can propagate only in
Select the correct option:
A part of longitudinal wave in which particles of the medium are farther away than the normal particles is called :
Sound is a ______ wave and needs a material medium to travel.
Match the following
| 1. | Infrasonic | (a) | Compressions |
| 2. | Echo | (b) | 22 kHz |
| 3. | Ultrasonic | (c) | 10 Hz |
| 4. | High-pressure region | (d) | Ultrasonography |
